Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment. The battery comprises a battery monomer and a heat management component, the battery cell includes a housing having a first wall. The heat management part is in heat conduction connection with the first wall, and a flow channel for containing a heat exchange medium is formed in the heat management part; wherein the first wall has a first surface facing the thermal management component, and the thermal management component has a second surface facing the battery cells; wherein the first surface is provided with a first point discharge part; and / or the second surface is provided with a second point discharge part. The structure can greatly improve the reliability of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] With the development of new energy technology, batteries are being used more and more widely. Batteries have high energy density, high safety, long service life, and are green and environmentally friendly to the social environment. They have been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery swap stations, engineering manufacturing, smart equipment, etc. At the same time, they also promote technical development and research in communications, medical equipment, energy development, etc.

[0003] In the development of battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The embodiments of the present application provide a battery and an electrical device, which can effectively improve the reliability of the battery.

[0005] In a first aspect, an embodiment of the present application provides a battery, the battery comprising a battery cell and a thermal management component. The battery cell comprises a housing, the housing having a first wall; the thermal management component is thermally connected to the first wall, and a flow channel for accommodating a heat exchange medium is formed inside the thermal management component; wherein the first wall has a first surface facing the thermal management component, and the thermal management component has a second surface facing the battery cell; the first surface is provided with a first tip discharge portion; and / or the second surface is provided with a second tip discharge portion.

[0006] In the above technical solution, by providing a first pointed discharge portion and / or a second pointed discharge portion, when a battery cell thermally runs away, the first pointed discharge portion and / or the second pointed discharge portion gathers charges to generate a pointed discharge phenomenon to destroy the thermal management component, and the heat exchange medium in the thermal management component is released to the vicinity of the thermally runaway battery cell, thereby alleviating secondary hazards and improving battery reliability.

[0007] In some embodiments, the first tip discharge portion is a protrusion or a concave portion; and / or the second tip discharge portion is a protrusion or a concave portion.

[0008] In the above technical solution, the first tip discharge portion is a convexity or a concave portion, which reduces the difficulty of preparing the first tip discharge portion. The second tip discharge portion is a convexity or a concave portion, which reduces the difficulty of preparing the second tip discharge portion.

[0009] In some embodiments, one of the first tip discharge portion and the second tip discharge portion is a protrusion, and the other is a concave portion, and at least a portion of the protrusion is received in the concave portion.

[0010] In the above technical solution, the protrusion and the groove cooperate to limit the movement of the battery cell relative to the thermal management component, thereby achieving a positioning effect.

[0011] In some embodiments, a plurality of the first tip discharge portions are provided, and the plurality of the first tip discharge portions are arranged at intervals; and / or a plurality of the second tip discharge portions are provided, and the plurality of the second tip discharge portions are arranged at intervals.

[0012] In the above technical solution, the multiple first pointed discharge parts and / or the multiple second pointed discharge parts make it easier for the thermal management component to be destroyed when the battery cell is in thermal runaway, so that the heat exchange medium is released in time.

[0013] In some embodiments, the first tip discharge portion is integrally formed with the first wall.

[0014] In the above technical solution, the first pointed discharge portion and the first wall are integrally formed, which reduces the difficulty of preparing the first wall and increases the production efficiency of the first wall.

[0015] In some embodiments, the thermal management component includes a first plate body and a second plate body which are stacked together, a groove is provided on the surface of the second plate body facing the first plate body, the first plate body covers the groove to form the flow channel, the surface of the first plate body facing away from the second plate body is the second surface, and the second tip discharge portion is integrally formed with the first plate body.

[0016] In the above technical solution, the second pointed discharge portion and the first plate body are integrally formed, which reduces the difficulty of preparing the first plate body and increases the production efficiency of the first plate body.

[0017] In some embodiments, along a direction perpendicular to the first surface, a projection of the first tip discharge portion at least partially overlaps with a projection of the flow channel; and / or,

[0018] Along a direction perpendicular to the second surface, a projection of the second tip discharge portion at least partially overlaps with a projection of the flow channel.

[0019] In the above technical solution, along the direction perpendicular to the first surface, the projection of the first tip discharge portion at least partially overlaps with the projection of the flow channel. When the battery cell thermally runs away, the area of ​​the thermal management component close to the flow channel is more easily damaged, thereby releasing the heat exchange medium in time.

[0020] Along the direction perpendicular to the second surface, the projection of the second tip discharge portion at least partially overlaps with the projection of the flow channel. When the battery cell thermally runs away, the area of ​​the thermal management component close to the flow channel is more easily damaged, thereby releasing the heat exchange medium in time.

[0021] In some embodiments, the battery further includes a glue layer, at least a portion of which is disposed between the first surface and the second surface.

[0022] In the above technical solution, providing the glue layer can improve the connection stability between the battery cell and the thermal management component.

[0023] In some embodiments, the outer shell includes a shell and an end cover, the shell includes a bottom wall and a side wall, the side wall is arranged around the bottom wall, one end of the side wall is connected to the bottom wall, and the other end forms an opening, the end cover covers the opening, and the bottom wall is the first wall.

[0024] In the above technical solution, the first pointed discharge portion is arranged on the bottom wall, which can reduce the influence on the structure of the battery cell in other directions.

[0025] In a second aspect, an embodiment of the present application provides an electric device, the electric device comprising the battery provided in the embodiment of the first aspect, wherein the battery is used to supply power to the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0028] Figure 2 An exploded schematic diagram of a battery according to some embodiments of the present application;

[0029] Figure 3 An exploded schematic diagram of a battery cell according to some embodiments of the present application;

[0030] Figure 4 A schematic diagram of the structure of a battery in some embodiments of the present application;

[0031] Figure 5 A cross-sectional view of a battery according to some embodiments of the present application;

[0032] Figure 6 for Figure 5 Enlarged view of the middle C part;

[0033] Figure 7 are cross-sectional views of batteries according to other embodiments of the present application;

[0034] Figure 8are cross-sectional views of batteries according to some other embodiments of the present application;

[0035] Fig. 9 A cross-sectional view of a battery according to some other embodiments of the present application;

[0036] Fig.10 sectional views of batteries according to some other embodiments of the present application;

[0037] Fig.11 for Fig.10 Enlarged view of the middle D part;

[0038] Fig.12 Cross-sectional views of batteries according to some other embodiments of the present application.

[0039] Icons: 100-battery; 10-battery cell; 11-housing; 111-end cover; 112-housing; 1121-bottom wall; a-first tip discharge portion; 1122-side wall; 1123-opening; 113-first wall; 1131-first surface; 12-electrode assembly; 13-electrode terminal; 14-pressure relief mechanism;

[0040] 20-box; 21-first part; 22-second part; 23-accommodating space;

[0041] 30-heat management component; 31-first plate; 311-second surface; b-second tip discharge portion; 32-second plate; 321-groove; 33-flow channel; 40-glue layer;

[0042] 1000-Vehicle; 200-Motor; 300-Controller;

[0043] The drawings are not drawn to scale. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0046] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0047] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0049] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0050] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0051] The term "plurality" used in the present application refers to two or more (including two).

[0052] In the present application, battery cells may include but are not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc. Battery cells include but are not limited to cylinders, flat bodies, rectangular parallelepipeds or other shapes, etc. Battery cells generally include cylindrical battery cells, square battery cells, etc. according to the packaging method.

[0053] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. Metal ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive electrode sheet and the negative electrode sheet from short-circuiting, while allowing active ions to pass through.

[0054] The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear.

[0055] Taking lithium-ion batteries as an example, the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0056] The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode tab.

[0057] The negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium may be used. The negative electrode active material may be carbon or silicon.

[0058] In order to ensure that a large current does not melt, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly can be a winding structure or a laminated structure.

[0059] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can reduce the impact of liquid or other foreign matter on the charging or discharging of the battery cells.

[0060] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0061] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0062] In some embodiments, multiple battery cells may be first integrated into at least one battery module and then the battery module may be installed in a box to form a battery pack. In this embodiment, auxiliary structural members such as beams may be provided between the battery modules to improve the installation stability of the battery module in the box.

[0063] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0064] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0065] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0066] Thermal runaway of battery cells usually occurs in rechargeable batteries such as lithium-ion batteries. It refers to a sharp rise in temperature due to runaway chemical reactions inside the battery cells, which may be accompanied by gas generation and expansion of the battery shell, and may even cause a series of secondary hazards such as fire or explosion.

[0067] Battery cells that have thermal runaway are already damaged and cannot be used any longer. How to reduce the secondary hazards caused by thermal runaway of battery cells becomes a difficult problem.

[0068] In view of this, in order to solve the problem of secondary hazards caused by thermal runaway of battery cells, an embodiment of the present application provides a battery, which includes a battery cell and a thermal management component, and the thermal management component is used to adjust the temperature of the battery cell. By setting a tip discharge part on at least one of the battery cell and the thermal management component, when the battery cell thermal runaway occurs, the tip discharge part gathers charges to generate a tip discharge phenomenon, destroying the thermal management component, and the heat exchange medium in the thermal management component is released to the surroundings of the thermal runaway battery cell, thereby reducing the secondary hazards caused by the thermal runaway battery cell and improving the reliability of the battery.

[0069] The technical solutions disclosed in the embodiments of the present application are applicable to but not limited to batteries and electrical equipment using batteries.

[0070] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0071] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0072] Please refer to Figure 1 , Figure 1 1 is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000.

[0073] The vehicle 1000 may further include a controller 300 and a motor 200 , wherein the controller 300 is used to control the battery 100 to supply power to the motor 200 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0074] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] In some embodiments, please refer to Figure 2 , Figure 2 The battery 100 of some embodiments of the present application is an exploded schematic diagram, and the battery 100 includes a plurality of battery cells 10. The plurality of battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of battery cells 10 are connected in series and in parallel.

[0076] In some embodiments, the battery 100 may further include a busbar component (not shown), and the multiple battery cells 10 may be electrically connected via the busbar component to achieve series connection, parallel connection, or mixed connection of the multiple battery cells 10 .

[0077] The busbar component may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0078] In some embodiments, the battery 100 may further include a box 20, which is used to accommodate the battery cell 10. The box 20 may include a first portion 21 and a second portion 22, which cover each other to define an accommodating space 23 for accommodating the battery cell 10. Of course, the connection between the first portion 21 and the second portion 22 may be sealed by a sealing element (not shown), which may be a sealing ring, a sealant, etc.

[0079] The first part 21 and the second part 22 may be in various shapes, such as a cuboid, a cylinder, etc. The first part 21 may be a hollow structure with one side open, and the second part 22 may be a hollow structure with one side open, and the open side of the second part 22 covers the open side of the first part 21, thereby forming a box body 20 with a receiving space 23. Of course, the first part 21 may be a hollow structure with one side open, and the second part 22 may be a plate-like structure, and the second part 22 covers the open side of the first part 21, thereby forming a box body 20 with a receiving space 23.

[0080] In some embodiments, the battery 100 may also include a thermal management component 30, which is used to accommodate a heat exchange medium to adjust the temperature of multiple battery cells 10. The heat exchange medium is a fluid, which may be a liquid or a gas. Adjusting the temperature means heating or cooling the multiple battery cells 10. In the case of cooling or lowering the temperature of the battery cells 10, the thermal management component 30 is used to accommodate a cooling fluid to lower the temperature of the multiple battery cells 10. At this time, the thermal management component 30 may also be referred to as a cooling component, a cooling system, or a cooling plate, etc., and the heat exchange medium contained therein may also be referred to as a cooling medium or a cooling fluid, more specifically, a coolant or a cooling gas. In addition, the thermal management component 30 may also be used for heating to increase the temperature of the multiple battery cells 10. Optionally, the fluid may be circulating to achieve a better temperature regulation effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, or air, etc.

[0081] Please refer to Figure 3 , Figure 3 This is a schematic exploded view of a battery cell 10 according to some embodiments of the present application. The battery cell 10 may include a housing 112 , an electrode assembly 12 , an end cap 111 , an electrode terminal 13 , and other functional components.

[0082] The shell 112 is a component for accommodating the electrode assembly 12. The shell 112 may be a hollow structure with an opening 1123 formed at one end, or a hollow structure with openings 1123 at both ends. The shell 112 may be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The shell 112 may be in a variety of shapes, such as a cylinder, a cuboid, etc. For example, in Figure 3 In the embodiment, the housing 112 is a rectangular parallelepiped.

[0083] The end cap 111 is a component that covers the opening 1123 of the shell 112 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 111 covers the opening 1123 of the shell 112, and the end cap 111 and the shell 112 together define a sealed space for accommodating the electrode assembly 12, the electrolyte and other functional components. The shape of the end cap 111 can be adapted to the shape of the shell 112. For example, the shell 112 is a rectangular parallelepiped structure, and the end cap 111 is a rectangular plate structure adapted to the shell 112. For another example, the shell 112 is a cylindrical structure, and the end cap 111 is a circular plate structure adapted to the shell 112. The material of the end cap 111 can also be a variety of materials. For example, the end cap 111 can be a metal material, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 111 can be the same as or different from the material of the shell 112.

[0084] In the battery cell 10, there can be one or two end caps 111. If the shell 112 is a hollow structure with an opening 1123 formed at one end, one end cap 111 is provided accordingly; if the shell 112 is a hollow structure with openings 1123 formed at both ends, two end caps 111 are provided accordingly, and the two end caps 111 cover the two openings 1123 of the shell 112 respectively. Figure 3 In the embodiment, one end cover 111 is provided.

[0085] Two electrode terminals 13 may be provided, namely a positive terminal and a negative terminal. The electrode terminal 13 may be provided on the end cap 111, and the combination of the electrode terminal 13 and the end cap 111 may be referred to as an end cap assembly.

[0086] In some embodiments, a pressure relief mechanism 14 may also be provided on the end cover 111. The pressure relief mechanism 14 is used to release the pressure inside the battery cell 10 when the pressure or temperature inside the battery cell 10 reaches a threshold value. The threshold value varies according to different design requirements. The threshold value may depend on one or more materials of the electrode, electrolyte and isolation membrane in the battery cell 10. The pressure relief mechanism 14 may take the form of an explosion-proof valve, an explosion-proof disk, a pressure relief valve, etc., and may specifically adopt a pressure-sensitive element or structure, that is, when the internal pressure of the battery cell 10 reaches a predetermined threshold value, the pressure relief mechanism 14 performs an action or a weak structure provided in the pressure relief mechanism 14 is destroyed, thereby forming an opening 1123 or a channel for internal pressure relief.

[0087] The pressure relief mechanism 14 may be disposed on the housing 112, or the pressure relief mechanism 14 may be disposed on the end cover 111. Figure 3 In the embodiment, the pressure relief mechanism 14 is arranged on the end cover 111 .

[0088] The embodiment of the present application provides a battery 100, which can reduce the secondary hazards caused by thermal runaway of the battery cell 10 and improve the reliability of the battery 100. The specific structure of the battery 100 is described in detail below with reference to the accompanying drawings.

[0089] Figure 4 A schematic diagram of the structure of a battery 100 according to some embodiments of the present application; Figure 5 A cross-sectional view of a battery 100 according to some embodiments of the present application; Figure 6 for Figure 5 Enlarged view of part C in the middle.

[0090] Reference Figures 3 to 6The embodiment of the present application provides a battery 100, which includes a battery cell 10 and a thermal management component 30. The battery cell 10 includes a housing 11, and the housing 11 has a first wall 113. The thermal management component 30 is thermally connected to the first wall 113, and a flow channel 33 for accommodating a heat exchange medium is formed inside the thermal management component 30; wherein the first wall 113 has a first surface 1131 facing the thermal management component 30, and the thermal management component 30 has a second surface 311 facing the battery cell 10.

[0091] In some embodiments, the first surface 1131 is provided with a first tip discharge portion a.

[0092] In some embodiments, the second surface 311 is provided with a second tip discharge portion b.

[0093] The first wall 113 may be any wall portion of the battery cell 10. In the embodiment where the battery cell 10 is a square battery cell 10, the first wall 113 may be a side wall 1122 or a bottom wall 1121 of the housing 11. In the embodiment where the battery cell 10 is a cylindrical battery cell 10, the first wall 113 may be a peripheral wall of the housing 11.

[0094] The heat management component 30 is thermally connected to the first wall 113, which means that the heat management component 30 has good thermal contact with the first wall 113, so that heat is transferred between the battery cell 10 and the heat management component 30, thereby adjusting the temperature of the battery cell 10. It can be direct contact or indirect contact through a heat conductive material.

[0095] The first tip discharge portion a is a conductor structure arranged on the first wall 113. The first tip discharge portion a is a structure that can cause electric charges to gather in the area, so that the electric field intensity of the first tip discharge portion a is much higher than that of the surrounding area, thereby easily inducing a tip discharge phenomenon. The first tip discharge portion a can be prepared by mechanical processing, 3D printing, chemical etching and other methods. The first tip discharge portion a includes but is not limited to structures such as protrusions, depressions, scratches, etc. formed on the first surface 1131. The first tip discharge portion a is provided, which can.

[0096] The second tip discharge portion b is a conductor structure provided on the thermal management component 30. The second tip discharge portion b is a structure that can cause electric charges to concentrate in the area, so that the electric field intensity of the second tip discharge portion b is much higher than that of the surrounding area, thereby easily inducing a tip discharge phenomenon. The second tip discharge portion b can be prepared by mechanical processing, 3D printing, chemical etching, etc. The second tip discharge portion b includes but is not limited to structures such as protrusions, depressions, scratches, etc. formed on the second surface 311.

[0097] A first tip discharge portion a may be provided on the first surface 1131, and a second tip discharge portion b may be provided on the second surface 311 (eg Figure 4 , Fig.10 and Fig.12 The first tip discharge portion a may be provided only on the first surface 1131, and not on the second surface 311 (as shown). Figure 5 , Figure 6 and Figure 7 Of course, the second tip discharge portion b may be provided only on the second surface 311, and not on the first surface 1131 (as shown in FIG. Figure 8 and Fig. 9 shown).

[0098] When the battery cell 10 is in normal use, the shell 11 is not charged, and a layer of insulating film is usually coated on the outside of the shell 11 to reduce the risk of short circuit between the battery cell 10 and other structures. When the battery cell 10 is in thermal runaway, the battery cell 10 is short-circuited internally, and the shell 11 is charged. At high temperatures, the insulating film on the surface of the shell 11 melts, and the thermal management component 30 is also charged, which satisfies the requirement that at least one of the first surface 1131 and the second surface 311 is provided with a tip discharge portion. The charges will gather in the area where the tip discharge portion is located to generate a tip discharge phenomenon, destroying the water cooling plate and releasing the heat exchange medium.

[0099] It is understandable that the heat exchange medium plays a role of heat exchange when the battery cell 10 is in normal use, and plays a role of fire fighting when the battery cell 10 is in thermal runaway. In order to improve the fire fighting effect, the heat exchange medium can be prepared from a non-combustible material with good electrical insulation performance.

[0100] In this embodiment, by providing the first pointed discharge portion a, when the battery cell 10 thermally runs away, the first pointed discharge portion a and / or the second pointed discharge portion b gather charges to generate a pointed discharge phenomenon to destroy the thermal management component 30, and the heat exchange medium in the thermal management component 30 is released to the surroundings of the thermal runaway battery cell 10, thereby reducing the secondary hazards caused by the thermal runaway battery cell 10 and improving the reliability of the battery 100.

[0101] By providing the second pointed discharge portion b, when the battery cell 10 thermally runs away, the second pointed discharge portion b gathers charges to generate a pointed discharge phenomenon to destroy the thermal management component 30, and the heat exchange medium in the thermal management component 30 is released to the surroundings of the thermal runaway battery cell 10, thereby reducing the secondary hazards caused by the thermal runaway battery cell 10 and improving the reliability of the battery 100.

[0102] Figure 7 sectional views of batteries 100 according to other embodiments of the present application.

[0103] Reference Figure 5 and Figure 7 In some embodiments, the first tip discharge portion a is a convex portion or a concave portion. The first tip discharge portion a is a convex portion or a concave portion, which reduces the difficulty of preparing the first tip discharge portion a.

[0104] Figure 8 sectional views of batteries 100 according to some other embodiments of the present application; Fig. 9 1 is a cross-sectional view of a battery 100 according to some further embodiments of the present application.

[0105] Reference Figure 8 and Fig. 9 In some embodiments, the second tip discharge portion b is a protrusion or a concave portion. The second tip discharge portion b is a protrusion or a concave portion, which reduces the difficulty of preparing the second tip discharge portion b.

[0106] It should be understood that both the protrusions and the concave portions can cause charge convergence and cause a tip discharge phenomenon. In some other embodiments, the first surface 1131 can also be provided with protrusions and concave portions at the same time. The second surface 311 can also be provided with protrusions and concave portions at the same time.

[0107] The protrusion can be a rounded protrusion or a sharp protrusion, as long as it can gather charges to produce a tip discharge phenomenon. Optionally, the protrusion is a sharp structure, and the more sharp parts, the more charge accumulation. The shape of the protrusion includes, but is not limited to, a cone, a wedge, a cuboid, a trapezoid, a special shape, etc.

[0108] The concave portion may be a rounded concave portion or a concave portion with a sharp inner surface, as long as it can cause the tip discharge phenomenon. For example, the connecting position between the side wall 1122 of the concave portion and the second surface 311 may be sharp, and the inner surface of the concave portion may be a conical surface. The shape of the concave portion includes but is not limited to a circular groove, a rectangular groove, a conical groove, a special-shaped groove, etc.

[0109] Fig.10 sectional views of batteries 100 according to some other embodiments of the present application; Fig.11 for Fig.10 Enlarged view of the middle D part; Fig.12 sectional views of batteries 100 according to some other embodiments of the present application.

[0110] In some embodiments, one of the first pointed discharge portion a and the second pointed discharge portion b is a protrusion, and the other is a concave portion, and at least a portion of the protrusion is accommodated in the concave portion.

[0111] For example, Fig.10 As shown, the first tip discharge portion a is a convex portion, and the second tip discharge portion b is a concave portion.

[0112] For example, Fig.10 As shown, the second pointed discharge portion b is a protrusion, and the first pointed discharge portion a is a concave portion.

[0113] In this embodiment, the protrusion and the recess cooperate. On the one hand, the protrusion and the recess cooperate to more easily cause the tip discharge phenomenon and timely damage the thermal management component 30. On the other hand, it can limit the movement of the battery cell 10 relative to the thermal management component 30, and play a positioning effect. On the other hand, the protrusion and the recess can share a part of the size, which is conducive to reducing the distance between the first surface 1131 and the second surface 311, and improving the energy density of the battery 100.

[0114] In some embodiments, a plurality of first tip discharge portions a are provided, and the plurality of first tip discharge portions a are arranged at intervals.

[0115] Two, three, four, five, etc. first tip discharge parts a may be provided.

[0116] In some embodiments, a plurality of second pointed discharge portions b are provided, and the plurality of second pointed discharge portions b are arranged at intervals.

[0117] Two, three, four, five, etc. second tip discharge parts b may be provided.

[0118] The plurality of first pointed discharge parts a and / or the plurality of second pointed discharge parts b make it easier for the thermal management component 30 to be destroyed and release the heat exchange medium in time when the battery cell 10 is in thermal runaway.

[0119] In some embodiments, the first pointed discharge portion a is integrally formed with the first wall 113. That is, the first pointed discharge portion a and the first wall 113 are formed at one time in the same manufacturing process, thereby providing better structural integrity.

[0120] In this embodiment, the first pointed discharge portion a and the first wall 113 are integrally formed, which reduces the difficulty of preparing the first wall 113 and increases the production efficiency of the first wall 113 .

[0121] Optionally, the first wall 113 is formed by stamping. For example, a pit is formed on the inner surface of the first wall 113, and a protrusion is formed at a position corresponding to the pit on the first surface 1131, so as to obtain a first tip discharge portion a protruding from the first surface 1131. The inner surface of the first wall 113 is the surface of the first wall 113 facing the inside of the battery cell 10, and the first surface 1131 can be understood as the outer surface of the first wall 113. For another example, a pit is formed on the first surface 1131, and a protrusion is formed at a position corresponding to the pit on the inner surface of the first wall 113, so as to obtain a first tip discharge portion a recessed on the first surface 1131.

[0122] Reference Fig.11In some embodiments, the thermal management component 30 includes a first plate body 31 and a second plate body 32 which are stacked, a groove 321 is provided on the surface of the second plate body 32 facing the first plate body 31, the first plate body 31 covers the groove 321 to form a flow channel 33, the surface of the first plate body 31 away from the second plate body 32 is the second surface 311, and the second tip discharge portion b is integrally formed with the first plate body 31.

[0123] That is, the second tip discharge portion b is formed at one time with the first plate body 31 in the same manufacturing process, thereby providing better structural integrity.

[0124] The shapes of the first plate body 31 and the second plate body 32 can be set as needed. Exemplarily, the heat management component 30 is rectangular, and the first plate body 31 and the second plate body 32 are configured as rectangular plates.

[0125] In the above technical solution, the second pointed discharge portion b is integrally formed with the first plate body 31 , which reduces the difficulty of preparing the first plate body 31 , and the production efficiency of the first plate body 31 is high.

[0126] Optionally, the second plate body 32 is formed by stamping.

[0127] Optionally, the first plate body 31 is formed by stamping. For example, a pit is formed on the side of the first plate body 31 facing the second plate body 32, and a protrusion is formed at a position corresponding to the pit on the second surface 311, so as to obtain a second tip discharge portion b protruding from the second surface 311. For another example, a pit is formed on the second surface 311, and a protrusion corresponding to the pit is formed on the side of the first plate body 31 facing the second plate body 32, so as to obtain a second tip discharge portion b concave on the second surface 311.

[0128] Reference Figure 6 and Fig.11 In some embodiments, along a direction perpendicular to the first surface 1131 , a projection of the first tip discharge portion a at least partially overlaps with a projection of the flow channel 33 .

[0129] The projection of the first discharge tip portion a may partially overlap with the projection of the flow channel 33. The projection of the first discharge tip portion a may completely overlap with the projection of the flow channel 33, for example, the projection of the first discharge tip portion a falls into the projection of the flow channel 33.

[0130] Along the direction perpendicular to the first surface 1131 , the projection of the first tip discharge portion a at least partially overlaps with the projection of the flow channel 33 . When the battery cell 10 thermally runs away, the area of ​​the thermal management component 30 close to the flow channel 33 is more easily damaged, thereby releasing the heat exchange medium in time.

[0131] Reference Fig.11 In some embodiments, along a direction perpendicular to the second surface 311 , a projection of the second tip discharge portion b at least partially overlaps with a projection of the flow channel 33 .

[0132] The projection of the second tip discharge portion b may partially overlap with the projection of the flow channel 33. The projection of the second tip discharge portion b may also completely overlap with the projection of the flow channel 33, for example, the projection of the second tip discharge portion b falls into the projection of the flow channel 33.

[0133] Along the direction perpendicular to the second surface 311, the projection of the second tip discharge portion b at least partially overlaps with the projection of the flow channel 33. When the battery cell 10 thermally runs away, the area of ​​the thermal management component 30 close to the flow channel 33 is more easily damaged, thereby releasing the heat exchange medium in time.

[0134] Reference Figure 6 In some embodiments, the battery 100 further includes a glue layer 40 , at least a portion of the glue layer 40 is disposed between the first surface 1131 and the second surface 311 .

[0135] Providing the glue layer 40 can improve the connection stability between the battery cell 10 and the thermal management component 30 .

[0136] Optionally, the adhesive layer 40 is a thermally conductive adhesive, thereby improving the heat transfer efficiency between the battery cell 10 and the thermal management component 30 .

[0137] In some embodiments, one of the first surface 1131 and the second surface 311 is provided with a protrusion as a tip discharge portion, while the other is not provided with a protrusion.

[0138] Usually, when the first surface 1131 and the second surface 311 are connected by the adhesive layer 40 , there is an adhesive overflow problem, that is, the adhesive overflows to the edge.

[0139] In this embodiment, by providing a protrusion with a preset thickness of the adhesive layer 40 , overflow of the adhesive layer 40 can be alleviated.

[0140] Reference Figure 3 In some embodiments, the housing 11 includes a shell 112 and an end cover 111, the shell 112 includes a bottom wall 1121 and a side wall 1122, the side wall 1122 is arranged around the bottom wall 1121, one end of the side wall 1122 is connected to the bottom wall 1121, and the other end forms an opening 1123, the end cover 111 covers the opening 1123, and the bottom wall 1121 is the first wall 113.

[0141] In this embodiment, the first pointed discharge portion a is disposed on the bottom wall 1121 , which can reduce the impact on other directions of the battery cell 10 .

[0142] An embodiment of the present application further provides an electric device, the electric device comprising the battery 100 provided in any of the above embodiments, and the battery 100 is used to supply power to the electric device.

[0143] Reference Figure 3 , Figure 5 and Figure 6 The embodiment of the present application also provides a battery 100, which includes a battery cell 10, a thermal management component 30 and a glue layer 40. The battery cell 10 includes a shell 11, which includes a shell 112 and an end cover 111. The shell 112 includes a bottom wall 1121 and a side wall 1122. The bottom wall 1121 and the side wall 1122 are integrally formed. The side wall 1122 is arranged around the bottom wall 1121. One end of the side wall 1122 is connected to the bottom wall 1121, and the other end forms an opening 1123. The end cover 111 covers the opening 1123. The bottom wall 1121 has a first surface 1131 facing the thermal management component 30. A flow channel 33 for accommodating a heat exchange medium is formed inside the thermal management component 30, and the thermal management component 30 has a second surface 311 facing the battery cell 10. The first surface 1131 is provided with a first tip discharge portion a, which is a protrusion. The bottom wall 1121 is punched to form the protrusion, and the height of the protrusion protruding from the first surface 1131 is between 0.1 mm and 2 mm. Along the direction perpendicular to the first surface 1131, the projection of the first tip discharge portion a at least partially overlaps with the projection of the flow channel 33. The adhesive layer 40 is provided between the first surface 1131 and the second surface 311.

[0144] Reference Figure 3 and Figure 8 The embodiment of the present application also provides a battery 100, which includes a battery cell 10, a thermal management component 30 and a glue layer 40. The battery cell 10 includes a shell 11, which includes a shell 112 and an end cover 111. The shell 112 includes a bottom wall 1121 and a side wall 1122. The bottom wall 1121 and the side wall 1122 are integrally formed. The side wall 1122 is arranged around the bottom wall 1121. One end of the side wall 1122 is connected to the bottom wall 1121, and the other end forms an opening 1123. The end cover 111 covers the opening 1123. The bottom wall 1121 has a first surface 1131 facing the thermal management component 30. A flow channel 33 for accommodating a heat exchange medium is formed inside the thermal management component 30, and the thermal management component 30 has a second surface 311 facing the battery cell 10. The second surface 311 is provided with a second tip discharge portion b, which is a protrusion. The heat management component 30 is punched to form the protrusion, and the height of the protrusion protruding from the first surface 1131 is between 0.1 mm and 2 mm. In the direction perpendicular to the second surface 311, the projection of the second tip discharge portion b at least partially overlaps with the projection of the flow channel 33. The adhesive layer 40 is provided between the first surface 1131 and the second surface 311.

[0145] Reference Figure 3 , Fig.10 and Fig.11The embodiment of the present application also provides a battery 100, which includes a battery cell 10, a thermal management component 30 and a glue layer 40. The battery cell 10 includes a shell 11, which includes a shell 112 and an end cover 111. The shell 112 includes a bottom wall 1121 and a side wall 1122. The bottom wall 1121 and the side wall 1122 are integrally formed. The side wall 1122 is arranged around the bottom wall 1121. One end of the side wall 1122 is connected to the bottom wall 1121, and the other end forms an opening 1123. The end cover 111 covers the opening 1123. The bottom wall 1121 has a first surface 1131 facing the thermal management component 30. A flow channel 33 for accommodating a heat exchange medium is formed inside the thermal management component 30, and the thermal management component 30 has a second surface 311 facing the battery cell 10. The first surface 1131 is provided with a first tip discharge portion a, which is a protrusion. The bottom wall 1121 is punched to form a protrusion, and the height of the protrusion protruding from the first surface 1131 is between 0.1 mm and 2 mm. In the direction perpendicular to the first surface 1131, the projection of the first tip discharge portion a at least partially overlaps with the projection of the flow channel 33. The second surface 311 is provided with a second tip discharge portion b, which is a concave portion. The thermal management component 30 is punched to form a concave portion. In the direction perpendicular to the second surface 311, the projection of the second tip discharge portion b at least partially overlaps with the projection of the flow channel 33. The protrusion is accommodated in the concave portion.

[0146] Reference Figure 3 , Fig.10 and Fig.12The embodiment of the present application also provides a battery 100, which includes a battery cell 10, a thermal management component 30 and a glue layer 40. The battery cell 10 includes a shell 11, which includes a shell 112 and an end cover 111. The shell 112 includes a bottom wall 1121 and a side wall 1122. The bottom wall 1121 and the side wall 1122 are integrally formed. The side wall 1122 is arranged around the bottom wall 1121. One end of the side wall 1122 is connected to the bottom wall 1121, and the other end forms an opening 1123. The end cover 111 covers the opening 1123. The bottom wall 1121 has a first surface 1131 facing the thermal management component 30. A flow channel 33 for accommodating a heat exchange medium is formed inside the thermal management component 30, and the thermal management component 30 has a second surface 311 facing the battery cell 10. The first surface 1131 is provided with a first tip discharge portion a, which is a concave portion, and the bottom wall 1121 is punched to form the concave portion. In the direction perpendicular to the first surface 1131, the projection of the first tip discharge portion a at least partially overlaps with the projection of the flow channel 33. The second surface 311 is provided with a second tip discharge portion b, which is a protrusion. The heat management component 30 is stamped to form the protrusion, and the height of the protrusion protruding from the first surface 1131 is between 0.1 mm and 2 mm. In the direction perpendicular to the second surface 311, the projection of the second tip discharge portion b at least partially overlaps with the projection of the flow channel 33. The protrusion is accommodated in the recess.

[0147] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0148] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: A battery cell including a housing having a first wall; A heat management component is thermally connected to the first wall, and a flow channel for accommodating a heat exchange medium is formed inside the heat management component; wherein the first wall has a first surface facing the thermal management component, and the thermal management component has a second surface facing the battery cell; The first surface is provided with a first tip discharge portion; and / or, The second surface is provided with a second tip discharge portion.

2. The battery according to claim 1, characterized in that The first tip discharge portion is a convex portion or a concave portion; and / or the second tip discharge portion is a convex portion or a concave portion.

3. The battery according to claim 2, characterized in that One of the first and second tip discharge portions is a protrusion, and the other is a concave portion, and at least a portion of the protrusion is accommodated in the concave portion.

4. The battery according to claim 1, characterized in that There are a plurality of first pointed discharge portions, which are arranged at intervals; and / or there are a plurality of second pointed discharge portions, which are arranged at intervals.

5. The battery according to claim 1, characterized in that The first tip discharge portion is integrally formed with the first wall.

6. The battery according to claim 1, characterized in that The thermal management component includes a first plate body and a second plate body which are stacked together, a groove is provided on a surface of the second plate body facing the first plate body, the first plate body covers the groove to form the flow channel, the surface of the first plate body facing away from the second plate body is the second surface, and the second tip discharge portion is integrally formed with the first plate body.

7. The battery according to any one of claims 1 to 6, characterized in that Along a direction perpendicular to the first surface, a projection of the first tip discharge portion at least partially overlaps with a projection of the flow channel; and / or, Along a direction perpendicular to the second surface, a projection of the second tip discharge portion at least partially overlaps with a projection of the flow channel.

8. The battery according to any one of claims 1 to 6, characterized in that The battery further includes a glue layer, at least a portion of which is disposed between the first surface and the second surface.

9. The battery according to any one of claims 1 to 6, characterized in that The shell includes a shell and an end cover, the shell includes a bottom wall and a side wall, the side wall is arranged around the bottom wall, one end of the side wall is connected to the bottom wall, and the other end forms an opening, the end cover covers the opening, and the bottom wall is the first wall.

10. An electrical device, characterized in that: The invention comprises the battery according to any one of claims 1 to 9, wherein the battery is used to supply power to the electrical device.

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